From Wikipedia:

Olivetans

The Olivetans, formally known as the Order of Our Lady of Mount Olivet, are a monastic order. They were founded in 1313 and recognised in 1344. They use the Rule of Saint Benedict and are a member of the Benedictine Confederation, where they are also known as the Olivetan Congregation, but are distinguished from the Benedictines in their white habit and centralized organisation. They use the post-nominals 'OSB Oliv'... Read More